You'll need to have an AUX-IN support on your headunit for it to work, at least, sound coming thru your car's speakers.
Items you'll need is the iPod(or any MP3 player), and a mini-stereo to RCA convertor plug if your HU has an AUX-IN, controls will be from the iPod though in terms of playback control.
Sound Quality would be as good as listening to MP3, it doesn't change ;)